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import './view-markdown-source.css';
import React from 'dom-chef';
import select from 'select-dom';
import delegate from 'delegate-it';
import CodeIcon from 'octicon/code.svg';
import FileIcon from 'octicon/file.svg';
import features from '../libs/features';
import * as pageDetect from '../libs/page-detect';
import fetchDom from '../libs/fetch-dom';
const buttonBodyMap = new WeakMap<Element, Element | Promise<Element>>();
async function fetchSource(): Promise<Element> {
const path = location.pathname.replace(/((?:[^/]+\/){2})(blob)/, '$1blame');
const dom = await fetchDom(path, '.blob-wrapper');
dom!.classList.add('rgh-markdown-source');
return dom!;
}
// Hide tooltip after click, it’s shown on :focus
function blurButton(button: HTMLElement): void {
if (button === document.activeElement) {
button.blur();
}
}
function dispatchEvent(element: HTMLElement, type: keyof GlobalEventHandlersEventMap): void {
element.dispatchEvent(new CustomEvent(type, {bubbles: true}));
}
/*
The dom of each version is stored on each button.
This acts as an auto-discarded cache without globals, timers, etc.
It should also work clicks on buttons sooner than the page loads.
*/
async function showSource(): Promise<void> {
const sourceButton = select<HTMLButtonElement>('.rgh-md-source')!;
const renderedButton = select<HTMLButtonElement>('.rgh-md-rendered')!;
sourceButton.disabled = true;
const source = buttonBodyMap.get(sourceButton) ?? fetchSource();
const rendered = await buttonBodyMap.get(renderedButton) ?? select('.blob.js-code-block-container')!;
buttonBodyMap.set(sourceButton, source);
buttonBodyMap.set(renderedButton, rendered);
rendered.replaceWith(await source);
sourceButton.disabled = false;
sourceButton.classList.add('selected');
renderedButton.classList.remove('selected');
blurButton(sourceButton);
dispatchEvent(sourceButton, 'rgh:view-markdown-source');
}
async function showRendered(): Promise<void> {
const sourceButton = select<HTMLButtonElement>('.rgh-md-source')!;
const renderedButton = select<HTMLButtonElement>('.rgh-md-rendered')!;
renderedButton.disabled = true;
(await buttonBodyMap.get(sourceButton))!.replaceWith(await buttonBodyMap.get(renderedButton)!);
renderedButton.disabled = false;
sourceButton.classList.remove('selected');
renderedButton.classList.add('selected');
blurButton(renderedButton);
dispatchEvent(sourceButton, 'rgh:view-markdown-rendered');
}
async function init(): Promise<false | void> {
if (!select.exists('.blob .markdown-body')) {
return false;
}
delegate(document, '.rgh-md-source:not(.selected)', 'click', showSource);
delegate(document, '.rgh-md-rendered:not(.selected)', 'click', showRendered);
select('.repository-content .Box-header .d-flex')!.prepend(
<div className="BtnGroup">
<button className="btn btn-sm BtnGroup-item tooltipped tooltipped tooltipped-n rgh-md-source" type="button" aria-label="Display the source blob">
<CodeIcon/>
</button>
<button className="btn btn-sm BtnGroup-item tooltipped tooltipped-n rgh-md-rendered selected" type="button" aria-label="Display the rendered blob">
<FileIcon/>
</button>
</div>
);
// Add support for permalinks to the code
if (location.hash.startsWith('#L')) {
await showSource();
// Enable selected line highlight
window.dispatchEvent(new HashChangeEvent('hashchange', {
oldURL: location.href,
newURL: location.href
}));
}
}
features.add({
id: __filebasename,
description: 'Adds a button to view the source of Markdown files.',
screenshot: 'https://user-images.githubusercontent.com/1402241/54814836-7bc39c80-4ccb-11e9-8996-9ecf4f6036cb.png'
}, {
include: [
pageDetect.isSingleFile
],
init
});
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